Shelf unit



FIG. 1 is a bottom front right perspective view of a shelf unit showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a back view thereof.

The broken lines shown in the figures represent portions of the shelf unit that form no part of the claimed design. 

CLAIM The ornamental design for a shelf unit, as shown and described. 